CN111056711A - Deaminizing and denitrogenating process for garbage leachate - Google Patents
Deaminizing and denitrogenating process for garbage leachate Download PDFInfo
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- CN111056711A CN111056711A CN201911392530.4A CN201911392530A CN111056711A CN 111056711 A CN111056711 A CN 111056711A CN 201911392530 A CN201911392530 A CN 201911392530A CN 111056711 A CN111056711 A CN 111056711A
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- landfill leachate
- rectifying tower
- deamination
- ammonium bicarbonate
- filter
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/26—Carbonates or bicarbonates of ammonium
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses a deamination and denitrification process for landfill leachate, which comprises the following steps: s1, treating the landfill leachate through a filter to remove large-volume suspended matters to obtain landfill filtrate; s2, heating the garbage filtrate processed by the filter through a heat exchanger, and feeding the garbage filtrate into a rectifying tower; s3, introducing the rectified garbage filtrate into a condenser for condensation reflux, refluxing the liquid subjected to condensation reflux into a rectifying tower for continuous rectification, and introducing the uncondensed gas into a gas reaction device; s4, introducing water and carbon dioxide into the gas reaction device to obtain an ammonium bicarbonate solution; s5, standing and centrifuging the ammonium bicarbonate solution to obtain ammonium bicarbonate crystals; s6, adjusting the pH value of the water produced at the bottom of the rectifying tower to 8, and carrying out biochemical treatment. The process adopted by the invention realizes that the deamination efficiency reaches 80% under the condition of not adding alkali, and the blown gas is used for preparing ammonium bicarbonate, thereby increasing the additional benefit and greatly reducing the pollution of ammonia to the environment.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a deamination and denitrification process for garbage leachate.
Background
Along with improvement of living conditions, the garbage output in China is continuously increased, and the garbage harmless treatment is more and more important. The garbage treatment modes in China generally comprise composting, anaerobic fermentation, sanitary landfill, incineration, pyrolysis and the like. Because the garbage in China has high inorganic component content, low calorific value and less combustible substances, the adoption of sanitary landfill is the main mode for treating the garbage in China.
However, during the process of stacking and burying garbage, due to anaerobic fermentation, rainfall erosion and other reasons, brown wastewater, commonly called garbage leachate, can be generated, and the content of organic matters, ammonia nitrogen and heavy metals in the wastewater is high. Meanwhile, the ammonia nitrogen content of the landfill leachate is increased along with the extension of the landfill time, the ammonia nitrogen content is high, the toxicity to anaerobic and aerobic microorganisms is high, and the further degradation of the microorganisms to organic matters can be inhibited.
The ammonia in the landfill leachate usually exists in the form of ammonium ions, and the existing form of ammonia is difficult to blow out at normal temperature. The deamination and denitrification pretreatment process for the landfill leachate generally adopts a stripping method, and the method is more economical and practical. In the specific method, excessive alkali agent is usually added into the landfill leachate to increase the pH value of the landfill leachate from 8.2 to 10.5, so that ammonium ions are converted into ammonia, and the landfill leachate after being blown off is added with acid agent to be adjusted to be neutral, but the blown-off ammonia gas is difficult to collect and is easy to leak into the air, so that air pollution is caused. Therefore, a method for replacing the prior art is needed to reduce the content of ammonia nitrogen in the landfill leachate.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a deamination and denitrification process for landfill leachate, which solves the technical problems in the prior art.
The purpose of the invention can be realized by the following technical scheme:
a deamination and denitrification process for landfill leachate comprises the following steps:
s1, treating the landfill leachate through a filter to remove large-volume suspended matters to obtain landfill filtrate;
s2, heating the garbage filtrate processed by the filter through a heat exchanger, and feeding the garbage filtrate into a rectifying tower;
s3, introducing the rectified garbage filtrate into a condenser for condensation reflux, refluxing the liquid subjected to condensation reflux into a rectifying tower for continuous rectification, and introducing the uncondensed gas into a gas reaction device;
s4, introducing water and carbon dioxide into the gas reaction device to obtain an ammonium bicarbonate solution;
s5, standing and centrifuging the ammonium bicarbonate solution to obtain ammonium bicarbonate crystals;
s6, adjusting the pH value of the water produced at the bottom of the rectifying tower to 8, and carrying out biochemical treatment;
wherein: the deamination efficiency of the landfill leachate is more than or equal to 80 percent.
Furthermore, the S1 filter is a high-pressure resistant filter cylinder with a tube-strip-seam screen, and the aperture of the filter is 1-3 mm.
Further, the heat exchanger in S2 is a plate heat exchanger, and is formed by stacking corrugated metal sheets, and thin rectangular channels are formed between the metal sheets.
Further, the temperature of the garbage filter liquor entering the rectifying tower through the heat exchanger in the S2 is 30-40 ℃.
Further, the rectifying tower in the S2 operates in a negative pressure state.
Furthermore, the rectifying tower adopts a plate-type structure.
Further, the heat source of the heat exchanger in S2 is derived from the heat release of the produced water at the bottom of the rectifying tower.
Further, in the step S3, the temperature of the air outlet of the condenser is controlled to be 38-42 ℃.
Further, the gas reaction device in S3 is a closed reactor, wherein the upper end portion is communicated with the gas outlet of the condenser, the top portion of the closed structure is provided with an automatic water spraying mechanism, and the carbon dioxide gas releasing mechanism is arranged in the middle of the gas reaction device.
Further, the performance index parameters of the landfill leachate in S1 are as follows: the ammonia nitrogen content is less than or equal to 5000mg/L, the CODcr is less than or equal to 5000mg/L, the TSS is less than or equal to 1000mg/L, and the pH value is maintained at 8.0-8.5.
The invention has the beneficial effects that:
1. the process adopted by the invention realizes that the deamination efficiency reaches 80% under the condition of not adding alkali, and the blown gas is used for preparing ammonium bicarbonate, thereby increasing the additional benefit and greatly reducing the pollution of ammonia to the environment.
2. The invention adopts a steam stripping method, utilizes the characteristic of high alkalinity of the landfill leachate and does not need to add an alkaline reagent. Along with the rise of the temperature, when the carbon dioxide is released, the ammonium ions are converted into ammonia gas, the ammonia gas is blown out, and the blown-out ammonia gas reacts with the carbon dioxide under the condition that water is used as a medium to prepare the ammonium bicarbonate, so that the problem of ammonia gas recovery is solved.
3. The heat exchange heat source of the landfill leachate is derived from the produced water at the bottom of the rectifying tower. Under the prerequisite of guaranteeing deamination efficiency, can reduce the column plate number of piles of rectifying column through the feeding temperature who improves the rectifying column, and then reduce the overall height of rectifying column, can reduce equipment cost, can also reduce the energy consumption that equipment was in the operation simultaneously.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic overall flow diagram of an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a deamination and denitrification process for landfill leachate, which includes the following steps:
s1, treating the landfill leachate through a filter to remove large-volume suspended matters; the selected parameters of the landfill leachate have the following indexes: the ammonia nitrogen content is less than or equal to 5000mg/l, the CODcr is less than or equal to 5000mg/l, the TSS is less than or equal to 1000mg/l, and the pH value is maintained at 8.0-8.5.
The filter is a high-pressure-resistant filter cylinder of a tube-strip seam screen, the aperture of the filter is 1-3mm, the filter has high filtering speed, high strength, rigidity and bearing capacity, the filtering precision is 1-3mm, the filter is in the form of a vertical cylinder and consists of a cylinder body and a cylinder, and the cylinder body is made of SUS 304.
Due to the complex composition of the landfill leachate, the landfill leachate comprises various impurities, insoluble substances and soluble substances. The filter has the functions of intercepting impurities and a small amount of insoluble substances in the landfill leachate, reducing the dirt blocking rate of the holes of the tower plate of the rectifying tower and reducing the cleaning times of the rectifying tower. The suspended matters mainly comprise fibers, branches, broken barks, hairs and the like, and the damage of the landfill leachate to subsequent equipment in the flowing process can be reduced.
S2, heating the garbage filtrate processed by the filter through a heat exchanger until the temperature of the garbage filtrate is required to enter a rectifying tower, wherein the feeding temperature of the rectifying tower is required to reach 30-40 ℃;
the heat exchanger is a plate heat exchanger and is formed by stacking corrugated metal sheets, thin rectangular channels are formed among the metal sheets, and the heat exchanger has the characteristics of high efficiency, energy conservation, easiness in cleaning, disassembly and assembly, long service life and the like. The heat source of the liquid exchanger is from the water producing side of the rectifying tower, and on the premise of ensuring the denitrification efficiency, the number of tower plate layers of the rectifying tower can be reduced by increasing the feeding temperature of the rectifying tower, so that the total height of the rectifying tower is reduced (the cost of equipment is reduced).
S3, rectifying the garbage filtrate, introducing the rectified garbage filtrate into a condenser for condensing and refluxing, controlling the temperature of an air outlet of the condenser, controlling the temperature of the air outlet of the condenser to be 38-42 ℃, refluxing the condensed and refluxed liquid into a rectifying tower for continuous rectification, and introducing uncondensed gas into a gas reaction device; the condenser is a horizontal tube type heat exchanger, the condensed water stroke is a tube side, and the gas stroke is a shell side.
Since the saturated vapor pressures of ammonia and moisture differ at different temperatures. The control of the gas outlet temperature of the condenser can control the total amount of water which is flushed into the gas reaction device together with the ammonia gas on one hand, and on the other hand, the control of the reflux quantity and the reflux ratio (the range is 1.7-2.0) of the condensate is also a key control parameter for realizing 80 percent of deamination rate in the patent.
S4, introducing water and carbon dioxide into the gas reaction device, and reacting to produce a high-concentration ammonium bicarbonate solution;
the gas reaction device is a closed reactor, the upper part of the gas reaction device is provided with an automatic water spraying mechanism, and the carbon dioxide gas releasing mechanism is arranged in the middle of the gas reaction device. The ammonia is from the gas outlet suction of condenser in the gas reaction unit, the ammonia forms the aqueous ammonia in water dissolution after the water spray, carbon dioxide gas release mechanism constantly releases carbon dioxide and aqueous ammonia reaction formation ammonium bicarbonate simultaneously, and carbon dioxide gas release mechanism sets up the area of contact of multiplicable carbon dioxide gas and aqueous ammonia in reaction unit's middle part, and the ammonia is constantly let in the gas reaction unit, lead to the pressure in the gas reaction unit to be greater than the ordinary pressure, be favorable to the solubility of gas in aqueous, make the reaction go on towards the direction that ammonium bicarbonate produced always. Can improve the generation rate of ammonium bicarbonate.
Chemical reactions involved in gas reaction apparatus
NH3+CO2+H2O＝NH4HCO3+ Heat quantity
S5, standing and centrifuging the ammonium bicarbonate solution to obtain ammonium bicarbonate crystals;
s6, adjusting the pH value of the produced water at the bottom of the rectifying tower to 8, and carrying out biochemical treatment in a biochemical process section so as to further reduce harmful components in the produced water.
The invention provides a deamination and denitrification process for landfill leachate, which realizes the deamination efficiency of 80 percent under the condition of no alkali addition, and the blown gas is used for preparing ammonium bicarbonate, thereby greatly reducing the pollution of ammonia to the environment.
The specific embodiment is as follows: tuo
The landfill leachate (CODcr: 3600mg/L, ammonia nitrogen content: 3800mg/L, TSS: 1000mg/L) from a landfill homogenizing tank in a certain old port is filtered by a high-pressure filter cylinder to remove fibers, branches, broken bark, hair and the like in the wastewater, so that the damage to subsequent equipment is reduced; the flow rate of the monomer filter cylinder is 40m3And h, 1 filter cartridge. And the produced water of the filter cartridge enters a heat exchanger for heat exchange, the temperature of the outlet water of the filter cartridge is raised to 38 ℃ from normal temperature, and the outlet water enters a rectifying tower, and the reflux ratio of the rectifying tower is 1.932.
The rectifying tower adopts the feeding of the middle tower plate layer, liquid flows from the middle part of the tower to the bottom of the tower, and steam flows from the bottom of the tower to the top of the tower, so that two-phase cross-flow contact is realized. The water inlet flow of the rectifying tower is 40m3H is used as the reference value. The steam pressure is 0.40MPa, and the steam flow is 3.40 t/h.
The steam amount required by each kilogram of landfill leachate is 85 kg.
The outlet gas temperature at the top of the rectifying tower is 58 ℃.
The temperature of the outlet water at the bottom of the rectifying tower is 80 ℃.
An on-line liquid level meter is arranged in the gas reaction device, and the water can be added in an intermittent mode and a continuous mode. What this application adopted is that the continuous type adds, along with the continuous accumulation of ammonia gas input to and the joining of carbon dioxide gas, ammonium bicarbonate liquid particle produces gradually and continuous decline to gas reaction unit's bottom under the action of gravity. The solution of ammonium bicarbonate is transferred to a storage tank by an external pump and centrifuged to obtain the finished ammonium bicarbonate crystal.
The centrifugal mother liquor can be used as additional water of the gas reaction device for recycling, the problem of processing the centrifugal mother liquor is solved, and the synthesis rate of ammonium bicarbonate is improved.
The ammonia nitrogen removal rate in the embodiment reaches 81.9 percent, and the ammonium bicarbonate production amount is 16kg/m3And (3) water.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (10)
1. The deamination and denitrification process of the landfill leachate is characterized by comprising the following steps of:
s1, treating the landfill leachate through a filter to remove large-volume suspended matters to obtain landfill filtrate;
s2, heating the garbage filtrate processed by the filter through a heat exchanger, and feeding the garbage filtrate into a rectifying tower;
s3, introducing the rectified garbage filtrate into a condenser for condensation reflux, refluxing the liquid subjected to condensation reflux into a rectifying tower for continuous rectification, and introducing the uncondensed gas into a gas reaction device;
s4, introducing water and carbon dioxide into the gas reaction device to obtain an ammonium bicarbonate solution;
s5, standing and centrifuging the ammonium bicarbonate solution to obtain ammonium bicarbonate crystals;
s6, adjusting the pH value of the water produced at the bottom of the rectifying tower to 8, and carrying out biochemical treatment;
wherein: the deamination efficiency of the landfill leachate is more than or equal to 80 percent.
2. The ammonia nitrogen removal process for landfill leachate of claim 1, wherein the S1 filter is a high pressure resistant filter cartridge of a tube-strip-and-slot screen, and the pore size of the filter is 1-3 mm.
3. The landfill leachate deamination and denitrification process according to claim 1, wherein the heat exchanger in S2 is a plate heat exchanger formed by stacking corrugated metal sheets with thin rectangular channels formed therebetween.
4. The ammonia nitrogen removal process for landfill leachate according to claim 3, wherein the temperature of the landfill leachate entering the rectifying tower through the heat exchanger in S2 is 30-40 ℃.
5. The landfill leachate deamination and denitrification process according to claim 1, wherein the rectifying tower in S2 operates in a negative pressure state.
6. The ammonia nitrogen removal process for landfill leachate according to claim 5, wherein the rectification tower adopts a plate-type structure.
7. The landfill leachate deamination and denitrification process according to claim 1, wherein the heat source of the heat exchanger in S2 is derived from the heat release of water produced at the bottom of the rectification tower.
8. The landfill leachate deamination and denitrification process according to claim 1, wherein in S3, the outlet of the condenser is controlled at a temperature of 38-42 ℃.
9. The landfill leachate deammoniation and nitrogen removal process as claimed in claim 1, wherein the gas reaction device in S3 is a closed reactor, wherein the upper end of the reactor is connected to the outlet of the condenser, the top of the closed structure is provided with an automatic water spraying mechanism, and the carbon dioxide gas releasing mechanism is disposed in the middle of the gas reaction device.
10. The ammonia nitrogen removal process for landfill leachate of claim 1, wherein the performance index parameters of landfill leachate in S1 are: the ammonia nitrogen content is less than or equal to 5000mg/L, the CODcr is less than or equal to 5000mg/L, the TSS is less than or equal to 1000mg/L, and the pH value is maintained at 8.0-8.5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911392530.4A CN111056711A (en) | 2019-12-30 | 2019-12-30 | Deaminizing and denitrogenating process for garbage leachate |
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| CN201911392530.4A CN111056711A (en) | 2019-12-30 | 2019-12-30 | Deaminizing and denitrogenating process for garbage leachate |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114920405A (en) * | 2022-05-25 | 2022-08-19 | 江南大学 | Efficient deamination device and method for leachate AnMBR effluent of waste incineration plant |
| CN114956293A (en) * | 2022-05-25 | 2022-08-30 | 江南大学 | Method for removing ammonia nitrogen in kitchen wastewater |
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| CN108585093A (en) * | 2018-04-09 | 2018-09-28 | 江苏凯利美环保科技有限公司 | The processing recycling ammonium hydrogen carbonate system and its processing recovery process of landfill leachate |
| CN208345794U (en) * | 2018-04-09 | 2019-01-08 | 无锡真水源环保科技有限公司 | Ammonium hydrogen carbonate system is recycled in the processing of landfill leachate |
| CN109879510A (en) * | 2019-04-17 | 2019-06-14 | 同济大学 | A kind of high ammonia-nitrogen wastewater ammonia recovery method |
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2019
- 2019-12-30 CN CN201911392530.4A patent/CN111056711A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108585093A (en) * | 2018-04-09 | 2018-09-28 | 江苏凯利美环保科技有限公司 | The processing recycling ammonium hydrogen carbonate system and its processing recovery process of landfill leachate |
| CN208345794U (en) * | 2018-04-09 | 2019-01-08 | 无锡真水源环保科技有限公司 | Ammonium hydrogen carbonate system is recycled in the processing of landfill leachate |
| CN109879510A (en) * | 2019-04-17 | 2019-06-14 | 同济大学 | A kind of high ammonia-nitrogen wastewater ammonia recovery method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114920405A (en) * | 2022-05-25 | 2022-08-19 | 江南大学 | Efficient deamination device and method for leachate AnMBR effluent of waste incineration plant |
| CN114956293A (en) * | 2022-05-25 | 2022-08-30 | 江南大学 | Method for removing ammonia nitrogen in kitchen wastewater |
| CN114956293B (en) * | 2022-05-25 | 2023-10-27 | 江南大学 | Method for removing ammonia nitrogen in kitchen wastewater |
| CN114920405B (en) * | 2022-05-25 | 2023-10-31 | 江南大学 | Efficient deamination device and method for leachate AnMBR effluent of waste incineration plant |
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